You can connect straight to the mount, there is a cable for this, £15 on Amazon, similar to EQMOD cable but obviously does not work with EQMOD, it connects from the 232 port on the mount to a USB port on PC..
Edit: sorry I see this has already been answered..
Stellarmate OS on Raspberry pi4b
Skywatcher EQ8 pro, on steel pier
Takahashi FSQ85, FS60cb & Meade 8” SCT (de-forked)
Starlight Xpress SXVR H18, SXVR M25c, Lodestar x2 Guide Camera
Pegasus Ultimate Hub V2 for all USB & Power
Pegasus focus motors on all scopes
I have an iEQ45 Pro. Bought it in October, still learning it - been cloudy 98% of the time . So far I like it very much, it holds my C8-N (8” Newtonian) very stable. Tracking is excellent, set up it easy. I connect my PIs (I run two distributed- one for guide cam & mount, one for main cam) to the RJ-12 RS232 port on the mount. VERY happy I bought this mount. Whether I use ASCOM or INDI the connection and control from my PC is simply rock solid. Build quality is solid, fit and finish good too. FWIW: Buy the tri-pier - a truly solid - and mobile foundation.
TPO 8" Ritchey-Chretien Astrograph
Moonlite CS focuser with Motor Drive
RoboFocus Auto Focuser
iOptron iEQ45 Pro Mount on Tripier
Stellarrmate OS RPi 4, 4GB
ZWO ASI533MC Pro Main Camera
Meoptex Off Axis Guider
Starlight Xpress Lodestar X2 Guide Camera
Polemaster Polar Alignment Camera
For controlling the CEM25P I use this
Its mounted on my mini pier and It plugs into the serial cable coming from the handset and talks to the sbc mounted on top of the telescope. Makes for one less cable going to the sbc.
NanoPC-T4 - Armbian focal
iOptron CEM25P mount
Photoline 80mm triplet refractor
ZWO ASI294MC Pro Imaging camera
ZWO ASI290MM mini Guide camera
ZWO ASI EAF focuser
My CEM60 is No.12, the early version. I don't mind of to be the laboratory rat of ioptron. But saying the truth, CEM60 is not a well designed mount.
1. 4 ports on both side are blocked by the two knobs, around latitude 40. This will cause some problems of the plug.
2. DEC is not on the correct axis. This leads to a rotary torque.
3. USB Hub is not powered. This will cause some problem on small ARM box like RPi and others who does not have very stable USD power output.
4. DEC wire is outside.
5. Polar scope is not well collimated in the factory.
6. You are forced to return to latitude 0 in order to put the mount back into the case.
7. Casting quality.
So I'm considering to 'upgrade' to CEM40 which has fixed all these issues.